GB/T 23671-2023
2-Hydroxy-6-naphthoic acid (English Version)
- Standard No.
- GB/T 23671-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 23671-2023
- Replace
- GB/T 23671-2009
- Scope
- This document specifies the requirements, sampling, test methods, inspection rules, as well as marking, labeling, packaging, transportation and storage of 2-hydroxy-6-naphthoic acid. This document is applicable to the quality control of 2-hydroxy-6-naphthoic acid products.
- Introduction
National Standard of the People's Republic of China GB/T 23671—2023
Standardized Interpretation and Application of 2-Hydroxy-6-Naphthoic Acid
Background and Significance of Standard Revision
GB/T 23671—2023 is a comprehensive revision of the original standard GB/T 23671—2009, mainly optimizing the quality requirements, test methods and production specifications of 2-Hydroxy-6-Naphthoic Acid. This revision adds terms and definitions, and updates a number of technical indicators to meet the new needs of industry development.
Comparison of standard frameworks
Items Requirements of the 2009 version Updates to the 2023 version Quality requirements Purity ≥ 99%, ash ≤ 0.1% Purity increased to ≥ 99.6% (superior quality), new metal content limit Detection method Only arbitration method Introduction of high performance liquid chromatography (HPLC) and improved melting point determination method Packaging requirements No clear requirements New moisture-proof and light-proof packaging specifications Interpretation of core indicators
Purity and impurity control: The 2023 version of the standard significantly increases the purity requirements for 2-hydroxy-6-naphthoic acid, with the top-grade product reaching ≥99.6%. At the same time, it strictly limits the content of major impurities such as 1-hydroxy-2-naphthoic acid and 2-hydroxy-3-naphthoic acid.
Improvement of detection method
The new standard introduces high-performance reversed-phase liquid chromatography, uses octadecyl bonded column as the separation medium, and optimizes the mobile phase ratio and detection wavelength. This method not only improves the detection sensitivity, but also shortens the analysis time.
New technical requirements and challenges
Case study: metal impurity control
The new standard adds limits for metal elements such as iron, potassium, and sodium. A production enterprise has significantly improved product quality by improving the production process and reducing the iron content from 50mg/kg to 10mg/kg.
Implementation suggestions
- Testing equipment upgrade:It is recommended that the enterprise be equipped with high performance liquid chromatograph and atomic absorption spectrometer to meet the testing requirements of the new version of the standard.
- Process optimization:Adjust production process parameters in response to the newly added quality indicators to ensure that the product meets the latest requirements.
- Staff training:Organize technical personnel to learn the new version of the standard and new testing methods to improve quality control capabilities.
GB/T 23671-2023 Referenced Document
- GB 20814 Limit and determination of the quantity of heavy-metal elements in dye products
- GB/T 15337-2008 General rules for atomic absorption spectrometric analysis
- GB/T 21876 Solvent dyes and intermediate of dyes.Determination of ash content
- GB/T 2381-2013 Dyestuffs and intermediate of dyestuffs.Determination of content of insoluble matters
- GB/T 2384-2021 Dyes intermediates—General method for the determination of melting range
- GB/T 2386-2014 Dyestuffs and intermediate of dyes.Determination of moisture content
- GB/T 6678-2003 General principles for sampling chemical products
- GB/T 6682-2008 Water for analytical laboratory use.Specification and test methods
- GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 23671-2023 history
- 2023 GB/T 23671-2023 2-Hydroxy-6-naphthoic acid
- 2009 GB/T 23671-2009 2-Hydroxy-6-naphthalene carboxylic acid